Quick access to frames in casts could be powerful:

@dwr.eth -> user
/dwr -> channel
$eth -> assets
+frame -> frame?

Other related idea is while $ works for tokens, there's not a great generic contract address standard. Frames paired to contract addresses as a default UI could be interesting.

Another thought:

If you linkify 0x4ed4e862860bed51a9570b96d89af5e1b0efefed, clients should be smart enough to know the action / verb here is "swap".

But what about 0xb47e3cd837ddf8e4c57f05d70ab865de6e193bbb ?

Render? Bid? Etc.

get contract abi and parse it looking for the right functions!? (maybe too much delay for that)